Marine vessel.



No. 888,274. PATENTED MAY 19, 1908. Y G. ETRISHMAN.

MARINE VESSEL.

APPLICATION FILEDVAPE. 14. 1904. BENEWED APB. 9. 1908.

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PATENTED MAY 19, 1908.

G P TRISHMAN. MARINE AVESSEL. QPLIOATION FILED A1114, 1804. nmvnwnn APB. 8. 1908.

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ATTO/ME No. 888,274. PATENTED MAY 19, 1908.

G.'P. TRISHMAN.

MARINE VESSEL.

APPLICATION FILED APR.14I 1904. RENEWED APB.. 9. 1908.

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BY 2m. /g MN) 110.8813374. 4 PATENTBDMAY19,1908. G. F. TRISHMAN.

MARINE VESSEL.

APPLIoATIoN FILED Amm. 1904. nmmwm) un. e. 190s.

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GEORGE FREDERICK TRISHMAN, OF OAKLAND, CALIFORNIA.

MARINE VESSEL.

Specification of Letters Patent.

Patented May 19, 1908.

Application led April 14, 1904,` Serial No. 203,128. Renewed April 9, 1908. Serial No, 426,083.

To all whon it may' concern:

Be it known that I, GEORGE FREDERICK TRISHMAN, a citizen of the United States, and a resident of Oakland, in` the countyv of Alameda and State of California, have invented a new and Improved Marine Vessel, of which the following is a full', clear, and exact description.

The ob]ect of this invention is to enable a marine vessel freely to clear herself when moving through the water.. l

It is well known that in marine vessels, and indeed, in all objects when moving through the water, there is a tendency to ret'ard the forward movement oi the vessel owingto the drag of 'water at the stern or in the wake of theA vessel, and this condition is one of the chief resistances to the propulsion of a ship.

M invention seeks to overcome this retardmg influence. I attain this end by providing walls establishing assages in the after body or run of the hull, t ese passages opening at the sternward facing-portions of the surface of the hull of the shlp, so that as the vessel moves through the water, air is drawn through the passages and passes out at the after portion of the vessel, thus overcoming' the drag or suction at the stern which causes resistance to the forward movement of the shi through the water.

his specificationv is an exact description of several examples of my invention, while the claims define the actual scope thereof.

Reference is. to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding artsin' all the views.

Figure 1 is a side e evation of the after part or run ofthe hull of a vessel,. showin my invention applied; 2 is an enlarged elevation of the foraminous ,wall which I preferably employ; Fig. 3 is a section of the same; Fig. 4 1s a rear elevation of the propellershowing the tubes for supplyin air thereto; Fig. 5 is a vertical section o the Stern portion of the vessel, showing the foram-inous wall built therein; Fig.- 6 is .a similar ,section show' v the wall as it will be when applied to a hu l already constructed; Fig. 7 is a horizontal section showing a further form ofmyinvention; Fig. 8 is a section on the line 8-8 of Fig. 7 Fig. 9 is a side view showing the application of the invention to the addle w eel of a s tern wheel vessel; and ig. 10 is a cross sectional view of the invention, applied to the paddle wheels of a side wheel vessel. I

One embodiment of my invention is shown in Figs. 1 to 5, and comprises a foraminous wall or sheathing for the after part of the hull. This sheathin has a number of major openings a preferably of rectangular form, with double beveled Walls as shown, and surrounding these major openings a are a num: ber ofv minor openin s b, thls arrangement being calculated to a ow the passage of air outward through the openings and spread the same yieldingly along the entire submerged sternward facing portion of the vessel, so that the air will be spread over this ortion. In Fig. 5 the foramlnous sheathingis built into the vessel during-the construction thereof, and 1n ,this case an auxlhary interior skin or sheathlng c 1s constructedr so as to make that part of the vessel watertight. In Fig.- 6 the foraminous sheathing is shown as it will lie when applied to a vessel already built, that is to say, outward from the sheathing or skin c of the vessel.

As shown 1n Figs. 5 and- 6, the foraminous sheathin and the skin of the vessel for'm an air cham er between them. The foraminous sheathing extends up slightly above the water line, and from this point an imperlorate extension d continuing t e air chamber `to the deck line, at which point a screen d is located to prevent foreign matter clogging the air chamber. As the vessel moves through the water, currents of air' will lbe draw-n down from the upper part of the vessel through the air chamasses to the deck of the vessel,A

bers and out through the foraminous sheathing, as indicated by the arrows in Figs. 5

and 6. I also purpose a plying this princiin connection with the ropeller, which conf' sists in air tubes e lea ing rearward from a suitable source ofair, and having their ends' e lyin around thepropeller. Air is drawn throug these tubes with the same result as explained with the foraminous sheathing. Also the propeller shaft f as shown in Fig. 5 m-ay be tubular, so that air currents may be drawn through the shaft.

A further ziorm of the ir'ivcntion is shown in Figs. 7 and 8, and comprises a wall below the water line made up of a number of separate horizontal, square tubes g arranged closely together as the drawings show and .'vessel/by lan air chamber 7L. This tubular Water at the stern.

wall extends from the bottom of the vessel upward' to a point approximately on the 'water line and above the tubes is a coaming i which extends up to the deck line.

The air chamber is open at the top and the action of this form of the invention is controlled by the same principle as that before explained.

' In applying my invention to the stern wheel of a steamer (see Fig. 9) I arrange, for example, tubes lc passing froma point in the hull above the Water linedow-nward below the paddle wheel and opening at this point, thereby establishing the before mentioned air passage, and relieving the submerged part of the paddle Wheel of the suction ordinarily following the same. The same result may be had in side Wheel steamers by tubes arranged, for example, like the tubes l in Fig. 10. These tubes lc and l may be of any number desired..

Various other-forms of the invention may be resorted to at will, without departing from the principle of my invention, which lies in the arrangement of walls in the after part or run of the hull of the vessel, or in or at the after part of another submerged part of the ship bywhich to form an air passage or passages leading from a point above the Water line to a point ybelow the same, and through which passages air may be drawn by the suction attending. the forward movement ofthe ship,` this air serving to enable the vessel to clear itself from the drag of the Having thus described my invention, l claim as new and desire'to 'secure by Letters Patent 1. A means for enabling a marine vessel to clear itself from the drag of the water at the stern when. the vessel is under way, which consists in devices forming a foraminous wall covering the submerged sternward facing portion of the after partlof the hull, and spaced-from the main sheathing of the vessel to form an air chamber, the upper portion ofthe air chamber communicating-With the atmosphere above the Water line, whereby 'as the vessel moves through the water air- -is --drawn down through said chamber and out -through said foraminous wall.

- 2.l vA means for enabling a marine vessel to clear-itself from'the dragof the lwater at the sternfwhen thejvessel is -under way, which consists in devices forming aforaminous Wall covering the submerged sternward facing after portion ofthe hull, and spaced from the main sheathing of the vessel, the said fo'- raminous Wall extending slightly above the Water' line, arrimperforate extension reaching from the u' per end `of the foraminous Wall to the'pdec lineofthe vessel, the .fo-

raminous Wall vand the extension g forming withfthesheathing ofthe vessel an ai'. clia`n1--v ber communicating at its upper portion with the atmosphere, whereby as the vessel moves through the water airis drawn down through said chamber and out through said foraminous wall, the said foraminous wall being formed of a number of essentially horizontal tubes lying closely together and open throughout their length.

8. The combination with a propeller driven marine vessel, of a/foraminous wall covering the submerged sternward facing after portionof the vessel and spaced from the main sheathing 'thereof to form an air chamber, the-upper part of which is open to the atmosphere above'the water line, andv one or more tubes open at both ends and extending from a point adjacent to the .propeller ofthe vessel upward into communication with the atmosphere above the water line, whereby when the vessel is under way air is drawn down through the said chamber and through the tubes.

4. The combination with a propeller' driven marine vessel, of a tube open at each end and extending from a point adjacent to the propeller of the vessel upward to a point above the water line, whereby upon the operation of the propeller air is drawn down through the tube and out of the submerged end thereof.

5. The combination with a propeller driven marine vessel, `of a foraminous wall covering the submerged sternward facing after portion of the hull and spaced from the main sheathing of the vessel, -the said fo-` raminous wall extending slightly above thev water line, an imperforate extensionreaching from the upper end of the foraminous wall to the-deck line of the vessel, the fo-y ramino'uswall and the extension forming With the sheathing of the vessel an air chamber extending to the deckline andcommunieating at its upper end with the atmosphere,

the said foraminous wall consisting of a numberof horizontal tubes lying closely together and open throughout their length, and one or more tubes openV at both ends and extending from a point adjacent to the propeller of the vessel upward into communication With the atmosphere above thewater line.

6. A marine lvessel having a propeller or propellers, and means establishing an air passage leading'from a point above the water v line to the vicinity of the propeller, the said means comprisinga series of tubes projecting rearward from the hull and having their ends lying around the propeller.v

In testimony whereof I, have 'signed .my name to this speciiication in the presence of two subscribing witnesses.-

GEORGE FREDERICK -raIsHMANi l Witnesses:

W. T. Hass, R; W.G1 L1.oeLEY. 

